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Error log on my index file get logged in the error_log.txt file but the same error log is not working in the functions.php file. I am using the latest WordPress and PHP 7.0. I am not using any plugin as well.

error_log("Hello there is an error");
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In order for error_log() to do anything, you do need to have the WP_DEBUG and WP_DEBUG_LOG constants set to true in your wp-config.php. (See: Debugging in WordPress in the Codex for more information.)

According to this answer on Stackoverflow, you should also set WP_DEBUG_DISPLAY for error_log() to function. Note that you can set it to true OR false, but it evidently needs to be defined.

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I had a similar problem: calling error_log() from wp-config.php works, but calling it from functions.php does not work for me.

I couldn't solve this issue but I've found a workaround that allowed me to do some sort of debugging at least. I gave up on error_log() and just wrote an own function that logs into a given file:

function mylog($txt) {
    file_put_contents('/home/myuser/logs/mylog.txt', $txt.PHP_EOL , FILE_APPEND | LOCK_EX);
}

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